Command line utility for decoding A2DP codec blobs

configure.ac

@@ -159,6 +159,10 @@ AC_ARG_ENABLE([rfcomm],
 	[AS_HELP_STRING([--enable-rfcomm], [enable building of bluealsa-rfcomm tool])])
 AM_CONDITIONAL([ENABLE_RFCOMM], [test "x$enable_rfcomm" = "xyes"])
 
+AC_ARG_ENABLE([a2dpconf],
+	[AS_HELP_STRING([--enable-a2dpconf], [enable building of a2dpconf tool])])
+AM_CONDITIONAL([ENABLE_A2DPCONF], [test "x$enable_a2dpconf" = "xyes"])
+
 AC_ARG_ENABLE([hcitop],
 	[AS_HELP_STRING([--enable-hcitop], [enable building of hcitop tool])])
 AM_CONDITIONAL([ENABLE_HCITOP], [test "x$enable_hcitop" = "xyes"])

src/a2dp-codecs.h

@@ -228,6 +228,18 @@
 	.frequency1 = ((f) >> 4) & 0xff, \
 	.frequency2 = (f) & 0x0f,
 
+#define ATRAC_CHANNEL_MODE_MONO         0x04
+#define ATRAC_CHANNEL_MODE_DUAL_CHANNEL 0x02
+#define ATRAC_CHANNEL_MODE_JOINT_STEREO 0x01
+
+#define ATRAC_SAMPLING_FREQ_44100       0x02
+#define ATRAC_SAMPLING_FREQ_48000       0x01
+
+#define ATRAC_GET_BITRATE(a) \
+	((a).bitrate1 << 16 | (a).bitrate2 << 8 | (a).bitrate3)
+#define ATRAC_GET_MAX_SUL(a) \
+	((a).max_sul1 << 8 | (a).max_sul2)
+
 #define APTX_VENDOR_ID                  BT_COMPID_APT
 #define APTX_CODEC_ID                   0x0001
 
@@ -379,6 +391,21 @@ typedef struct {
 	uint8_t bitrate3;
 } __attribute__ ((packed)) a2dp_aac_t;
 
+typedef struct {
+	uint8_t rfa1:2;
+	uint8_t channel_mode:3;
+	uint8_t version:3;
+	uint8_t bitrate1:3;
+	uint8_t vbr:1;
+	uint8_t frequency:2;
+	uint8_t rfa2:2;
+	uint8_t bitrate2;
+	uint8_t bitrate3;
+	uint8_t max_sul1;
+	uint8_t max_sul2;
+	uint8_t rfa3;
+} __attribute__ ((packed)) a2dp_atrac_t;
+
 typedef struct {
 	a2dp_vendor_codec_t info;
 	uint8_t channel_mode:4;
@@ -450,6 +477,21 @@ typedef struct {
 	uint8_t bitrate3;
 } __attribute__ ((packed)) a2dp_aac_t;
 
+typedef struct {
+	uint8_t version:3;
+	uint8_t channel_mode:3;
+	uint8_t rfa1:2;
+	uint8_t rfa2:2;
+	uint8_t frequency:2;
+	uint8_t vbr:1;
+	uint8_t bitrate1:3;
+	uint8_t bitrate2;
+	uint8_t bitrate3;
+	uint8_t max_sul1;
+	uint8_t max_sul2;
+	uint8_t rfa3;
+} __attribute__ ((packed)) a2dp_atrac_t;
+
 typedef struct {
 	a2dp_vendor_codec_t info;
 	uint8_t frequency:4;

utils/Makefile.am

@@ -5,6 +5,12 @@ SUBDIRS = aplay rfcomm
 
 bin_PROGRAMS =
 
+if ENABLE_A2DPCONF
+bin_PROGRAMS += a2dpconf
+a2dpconf_CFLAGS = \
+	-I$(top_srcdir)/src
+endif
+
 if ENABLE_HCITOP
 bin_PROGRAMS += hcitop
 hcitop_CFLAGS = \